// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// resolves . and .. elements in a path array with directory names there
// must be no slashes, empty elements, or device names (c:\) in the array
// (so also no leading and trailing slashes - it does not distinguish
// relative and absolute paths)
define(["require", "exports"], function (require, exports) {
  'use strict';
  Object.defineProperty(exports, "__esModule", { value: true });
  function normalizeArray(parts, allowAboveRoot) {
    // if the path tries to go above the root, `up` ends up > 0
    var up = 0;
    for (var i = parts.length - 1; i >= 0; i--) {
      var last = parts[i];
      if (last === '.') {
        parts.splice(i, 1);
      } else if (last === '..') {
        parts.splice(i, 1);
        up++;
      } else if (up) {
        parts.splice(i, 1);
        up--;
      }
    }

    // if the path is allowed to go above the root, restore leading ..s
    if (allowAboveRoot) {
      for (; up--; up) {
        parts.unshift('..');
      }
    }

    return parts;
  }

  // Split a filename into [root, dir, basename, ext], unix version
  // 'root' is just a slash, or nothing.
  var splitPathRe =
    /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
  var splitPath = function (filename) {
    return splitPathRe.exec(filename).slice(1);
  };

  // path.resolve([from ...], to)
  // posix version
  exports.resolve = function () {
    var resolvedPath = '',
      resolvedAbsolute = false;

    for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
      var path = (i >= 0) ? arguments[i] : window.editingFolder;//process.cwd();

      // Skip empty and invalid entries
      if (typeof path !== 'string') {
        throw new TypeError('Arguments to path.resolve must be strings');
      } else if (!path) {
        continue;
      }

      resolvedPath = path + '/' + resolvedPath;
      resolvedAbsolute = path.charAt(0) === '/';
    }

    // At this point the path should be resolved to a full absolute path, but
    // handle relative paths to be safe (might happen when process.cwd() fails)

    // Normalize the path
    resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function (p) {
      return !!p;
    }), !resolvedAbsolute).join('/');

    return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
  };

  // path.normalize(path)
  // posix version
  exports.normalize = function (path) {
    var isAbsolute = exports.isAbsolute(path),
      trailingSlash = substr(path, -1) === '/';

    // Normalize the path
    path = normalizeArray(filter(path.split('/'), function (p) {
      return !!p;
    }), !isAbsolute).join('/');

    if (!path && !isAbsolute) {
      path = '.';
    }
    if (path && trailingSlash) {
      path += '/';
    }

    return (isAbsolute ? '/' : '') + path;
  };

  // posix version
  exports.isAbsolute = function (path) {
    return path.charAt(0) === '/';
  };

  // posix version
  exports.join = function () {
    var paths = Array.prototype.slice.call(arguments, 0);
    return exports.normalize(filter(paths, function (p, index) {
      if (typeof p !== 'string') {
        throw new TypeError('Arguments to path.join must be strings');
      }
      return p;
    }).join('/'));
  };


  // path.relative(from, to)
  // posix version
  exports.relative = function (from, to) {
    from = exports.resolve(from).substr(1);
    to = exports.resolve(to).substr(1);

    function trim(arr) {
      var start = 0;
      for (; start < arr.length; start++) {
        if (arr[start] !== '') break;
      }

      var end = arr.length - 1;
      for (; end >= 0; end--) {
        if (arr[end] !== '') break;
      }

      if (start > end) return [];
      return arr.slice(start, end - start + 1);
    }

    var fromParts = trim(from.split('/'));
    var toParts = trim(to.split('/'));

    var length = Math.min(fromParts.length, toParts.length);
    var samePartsLength = length;
    for (var i = 0; i < length; i++) {
      if (fromParts[i] !== toParts[i]) {
        samePartsLength = i;
        break;
      }
    }

    var outputParts = [];
    for (var i = samePartsLength; i < fromParts.length; i++) {
      outputParts.push('..');
    }

    outputParts = outputParts.concat(toParts.slice(samePartsLength));

    return outputParts.join('/');
  };

  exports.sep = '/';
  exports.delimiter = ':';

  exports.dirname = function (path) {
    var result = splitPath(path),
      root = result[0],
      dir = result[1];

    if (!root && !dir) {
      // No dirname whatsoever
      return '.';
    }

    if (dir) {
      // It has a dirname, strip trailing slash
      dir = dir.substr(0, dir.length - 1);
    }

    return root + dir;
  };


  exports.basename = function (path, ext) {
    var f = splitPath(path)[2];
    // TODO: make this comparison case-insensitive on windows?
    if (ext && f.substr(-1 * ext.length) === ext) {
      f = f.substr(0, f.length - ext.length);
    }
    return f;
  };


  exports.extname = function (path) {
    return splitPath(path)[3];
  };

  function filter(xs, f) {
    if (xs.filter) return xs.filter(f);
    var res = [];
    for (var i = 0; i < xs.length; i++) {
      if (f(xs[i], i, xs)) res.push(xs[i]);
    }
    return res;
  }

  // String.prototype.substr - negative index don't work in IE8
  var substr = 'ab'.substr(-1) === 'b'
    ? function (str, start, len) { return str.substr(start, len) }
    : function (str, start, len) {
      if (start < 0) start = str.length + start;
      return str.substr(start, len);
    }
    ;
});